Beth sy'n gwneud dydd a nos
By: Franklyn M. Branley ; darluniau gan Arthur Dorros.
Contributors: Dorros, Arthur.; Jones, Berwyn Prys.
Series: Golwg gyntaf
Publisher: Ivan Corbett
Published: 1990
Place of publication: Penryn
Language: wel
Number of pages: 29
Subjects: Earth -- Rotation -- Juvenile literature.
Work titles: What makes day and night.
Notes: Arg Saesneg blaenorol = Previous English ed: Harper & Row, 1986.

Addasiad Cymraeg gan Berwyn Prys Jones = Welsh adaptation by Berwyn Prys Jones.

Cyfieithiad o = Translation of: What makes day and night.